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Unsecured Senior Notes (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Oct. 15, 2021
Sep. 29, 2021
Mar. 16, 2021
Feb. 14, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]              
Repayments of Unsecured Debt         $ 1,841,500 $ 0 $ 699,237
Loss from early extinguishment of debt         45,182 0 29,540
Proceeds from unsecured senior notes         1,695,996 1,248,125 1,548,106
Debt prepayment and extinguishment costs         (43,036) 0 (28,716)
Senior Notes         9,483,695 9,639,287  
Boston Properties Limited Partnership              
Debt Instrument [Line Items]              
Repayments of Unsecured Debt         1,841,500 0 699,237
Loss from early extinguishment of debt         45,182 0 29,540
Proceeds from unsecured senior notes         1,695,996 1,248,125 1,548,106
Debt prepayment and extinguishment costs         (43,036) 0 $ (28,716)
Senior Notes         9,483,695 $ 9,639,287  
Senior Notes | Boston Properties Limited Partnership              
Debt Instrument [Line Items]              
Debt         $ 9,550,000    
Debt Instrument, Covenant Description         The indenture relating to the unsecured senior notes contains certain financial restrictions and requirements, including (1) a leverage ratio not to exceed 60%, (2) a secured debt leverage ratio not to exceed 50%, (3) an interest coverage ratio of greater than 1.50, and (4) an unencumbered asset value of not less than 150% of unsecured debt.    
Debt Instrument, Covenant Compliance         At December 31, 2021, Boston Properties Limited Partnership was in compliance with each of these financial restrictions and requirements.    
Senior Notes         $ 9,483,695    
2.671% unsecured senior notes | Senior Notes | Boston Properties Limited Partnership              
Debt Instrument [Line Items]              
Debt     $ 850,000   $ 850,000    
Debt Instrument, Interest Rate, Stated Percentage     2.55%   2.55%    
Senior Notes Pricing     99.57%        
Debt Instrument, Interest Rate, Effective Percentage     2.671%   2.671% [1]    
Proceeds from unsecured senior notes     $ 839,200        
4.289% unsecured senior notes | Senior Notes | Boston Properties Limited Partnership              
Debt Instrument [Line Items]              
Debt       $ 850,000      
Debt Instrument, Interest Rate, Stated Percentage       4.125%      
Repayments of Unsecured Debt       $ 858,700      
Debt Instrument, Increase, Accrued Interest       8,700      
Loss from early extinguishment of debt       $ 400      
2.524% unsecured senior notes | Senior Notes | Boston Properties Limited Partnership              
Debt Instrument [Line Items]              
Debt   $ 850,000     $ 850,000    
Debt Instrument, Interest Rate, Stated Percentage   2.45%     2.45%    
Senior Notes Pricing   99.959%          
Debt Instrument, Interest Rate, Effective Percentage   2.524%     2.524% [1]    
Proceeds from unsecured senior notes   $ 842,500          
3.954% unsecured senior notes | Senior Notes | Boston Properties Limited Partnership              
Debt Instrument [Line Items]              
Debt $ 1,000,000            
Debt Instrument, Interest Rate, Stated Percentage 3.85%            
Repayments of Unsecured Debt $ 1,050,000            
Debt Instrument, Increase, Accrued Interest 7,900            
Loss from early extinguishment of debt $ 44,200            
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 104.284%            
Debt prepayment and extinguishment costs $ 42,800            
[1] Yield on issuance date including the effects of discounts on the notes, settlements of interest rate contracts and the amortization of financing costs.